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Related Experiment Videos

Cholesteric elastomers: deformable photonic solids.

Y Mao1, E M Terentjev, M Warner

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 3, 2001
PubMed
Summary
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Mechanical strain unwinds the helical director in cholesteric elastomers by altering the director

Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Cholesteric elastomers exhibit unique director distributions influenced by their helical structure.
  • Mechanical and electric fields can modulate the director orientation in these materials.
  • Understanding the interplay between rubber elasticity and director anchoring is crucial.

Purpose of the Study:

  • To investigate the effects of mechanical strain on the helical director distribution in monodomain cholesteric elastomers.
  • To compare the mechanical response to the known electric field response in cholesteric liquid crystals.
  • To elucidate the mechanisms of director unwinding under different strain conditions.

Main Methods:

  • Applying controlled mechanical strain (stretching) to monodomain cholesteric elastomers.

Related Experiment Videos

  • Observing changes in the helical director distribution using various characterization techniques.
  • Analyzing the role of rubber elasticity and director anchoring in the observed phenomena.

    • Main Results:

    • Stretching perpendicular to the helix axis eliminates twist walls above a critical strain, leading to a uniform unwound state.
    • Below the critical strain, director coarsening occurs with an affine decrease in pitch.
    • Stretching along the helical axis induces unwinding through conical director states.
    • Frank elasticity is less significant than the director-matrix interplay unless the gel is very weak.

    Conclusions:

    • Mechanical strain is an effective method for controlling and unwinding the helical director in cholesteric elastomers.
    • The response to mechanical strain differs from that of electric fields, highlighting unique elastomer properties.
    • The interplay between the rubber elastic matrix and director anchoring governs the deformation behavior.